Marine lamp and lens



Allg- 1929- H. w. ARMSTRONG 1,723,979

MARINE LAMP AND LENS File July 1928 2 Sheets-Sheet l I [NI/E TOR 7,4 k dwz w Q72 A T ORA EV Aug. 6, 1929. H. w. ARMSTRONG MARINE LAMP AND LENS Filed July 16, 1928 2 Sheets-Sheet 2 TZORNE Y Patented Au. 6, 1929.

warren stares 1,723,979 nr diaries.

trait.

HENRY N. ARMSTRONG, U13 BRISTOL, CONNECTICUT, ASSIGNOR TO THE NATIONAL MAE-LINE LAME CUIVIPANY, 01E FURESTVTLLE, CONNECTICUT, A CORPUBATION OF IJIARINE LAMP AND LENS.

Application filed July 16,

Ships running ligl'its, as usually constructed, are made with a (le pression in the metal front of the lamp, in which depression the lens is set so that it is sunl; into the front.

The object of the present invention to secure the depression of the lens in a sim pler and more advantageous manner, pen mitting, also, ready removal and replacement.

l-iccording to this invention a lens provided having a raised marginal portion, which when applied against the back of a plain lamp front causes the fluted portion of the lens to be set back. The marginal portion of the lens thus prodi ces the depression which was formerly made in the metal part of the lamp.

Means are provided for detachably securing the lens against the back of the front, and the front is hingedto a'llord access to the said means, so that the lens may be readily taken out or put in.

A rib around the inner edge of the raised portion of the lens fits the edge of the lamp front around the light opening and prevents any displacement of the lens sideways or vertically when the lens 18 held against the back of the lamp front by clamping means of simple nature.

In the accompanying drawing forming part hereof:

Fig. 1 is a front elevation of a ships running-light embodying the invention, the upper portion of the lamp being broken away; Fig. 2 is a horizontal section on the line 22 of Fig. 1, with the lens in plan view, the rear portion of the lamp being broken away; Fig. 3 is a front elevation of the lens; Fig. 4 is a horizontal section on the line 4.-1 of Fig. 3; and Fig. 5 is a vertical section on the line 5-5 of Fig. 3.

The ships running light illustrated in these drawings comprises a lantern enclosure 2 of a familiar form, and a source of light 3 therein. The front 4 of the lamp is hinged at one side to the body 5 by a hinge 6 so that the front can be opened like a door. It is held securely closed by means such as, for example, that marked 7. The front and its fastening means preferably embody features disclosed and claimed in my copending application Serial No. 275,828, filed May 5, 1928.

The metal front is provided with a rec- 1928. Serial No. 293,055.

ii-angular light opening 8. lit is not con structed with the usual lens-receiving de pression, but is simply formed on a curve.

The lens 9 in its body portion is a customary Fresnel lens of the cylindrically curved kind. The term cylindrically curved is not necessarily exact, since the curvature need not be truly circular. This part of the lens has the customary bulged central portion 10 and the customary retracting prisms 11 above and below.

Smrrounding this fluted part or body the lens has an integral raised marginal portion 12. This raised portion is formed to lit against the back of the lamp front laround the light opening, and the depth of the raised portion is sufficient so that, when it thus placed, the fluted portion of the lens is depressed or set back with reference to the lamp front, giving the same position to the lens proper that is ordinarily obtained by making a depression in the metal front.

A small rib 18 rising slightly from the inner edge of the raised portion 12, extending all the way around, fits within the edge of the light opening in the metal front, thereby tireventing movement of the lens up or down or to either side, so that it is sutiicient merely to hold the lens against the back of the lamp front by simple clamp pieces 14;. These clamp pieces are preferably metal strips at the two vertical sides of the lens, the strips having front and rear flan es 15 bent in reverse directions, the rear flanges engaging over the back of the lens, and the front flanges being detachably secured by screws 16 to nuts 17, which are soldered to the back of the lamp front at opposite sides of the light opening.

Guard bars 18 maybe provided in front 9 of the lens. These bars can be permanently secured to the lamp front, above and below the light opening, without interfering with the removability of the lens, since the lens is put in or taken out from the back of the hinged front or door 4:.

It will be understood that the invention is not limited to the precise form and details which have been illustrated.

I claim:

1. A marine lamp having a front provided with a light opening but without the usual lens-receiving depression and a cylindrically curved lens having a raised outer portion applied against the back of said portion applied against the back of said front around the light opening, the fluted portion of thelens being depressed in relation to said marginal portion and to said front, said front being hinged so that application and removal of the lens at the back of the front is facilitated.

3. A marine lamp having a front provided with a light opening, a cylindrically curved lens having a. raised outer portion and a depressed fluted portion, and means removably securing said lens at the back of said front.

4. A marine lamp having a front provided with a light opening, a cylindrieally curved lens having a raised outer portion and a depressed fluted portion, said raised portion having a rib fitting the edge of said opening, and clamps holding said lens with its raised portion against the back of said front.

5. A cylindrically curved lens of the class described having a forwardly raised outer portion surrounding the fluted portion, whereby to depress said fluted portion with reference to the front of a lamp.

6. A cylindrically curved lens of the class described having a forwardly raised outer portion surrounding the fluted portion, whereby to depress said fluted portion with reference to the front of a lamp, said raised outer portion having a rib adapted to fit the edge of a lamp front around a light opening.

7. A oylindrically curved lens for a marine lamp, said lens being transversely fluted with prisms on the outer side and having a forwardly raised margin extending around the fluted body portion to depress the fluted body portion below the front of the lamp when said raised margin applied against the back of the lamp front.

HENRY \V. ARMSTRONG. 

